This sets the initial value of the given property. If the property exists as a EmitterTweenController already, it will modify the current 'begin' keyframe. If it doesn't, this creates a new EmitterTweenController and sets its 'begin' keyframe.

Note: this only sets EmitterTweenControllers, NOT EmitterPhysicsControllers.

Parameters

property:String — The emitter's property to be set.

value:* — The property's value.

spread:* (default = 0) — The spread of the value. If this is anything besides '0', a random value will be generated using the value and spread.

precision:int (default = 0) — The amount of decimal points used when creating a spread value

extras:Object (default = null) — An 'extras' object to be passed to the tween engine for that keyframe.